Put washed and drained lentils in a pan with the broth and cook for 20' until tender.At the end of the cooking add broccoli,cover and cook for a few minutes.Drain the vegetables.

Meanwhile,saute the chopped onions,then add tomatoes and cook for 5'.Add the spices and a pinch of sugar.Mix tomato sauce with lentils and broccoli,transfer to the ovenproof dish and top with grated cheese.Put it in a hot oven for a few minutes until the cheese is melted.